MSI Distribution Transformer

  • Single Phase • Three Phase
  • Power ratings: up to 3000 KVA
  • Frequency: up to 100KHZ
  • Windings: Copper and Aluminum
  • Voltage class: up to 25kV
  • BIL Ratings: Up to 125 kV
  • Cooling: Self, Forced and Water



  • UL Recognized insulation system (Primary voltage less than 600V);  130, 180, and 220°C systems are available
  • CE marking with declaration of conformity (ROHS and Low Voltage Directive)
  • Private labeling with customer supplied nameplate artwork (Units that are private labeled cannot carry our UL label)
  • Open core and coil, or installed into one of MSI’s in-stock NEMA 1 or 3R enclosures., custom enclosure designs and finishes are also available
  • MSI’s engineering team provides detailed 2D drawings or 3D Solidworks models.
  • Normally closed or normally open thermal switches can be installed to protect the transformer coils and MSI also offers thermocouples and platinum RTDs for advanced winding temperature monitoring


MSI transformers are fully tested before shipping, both electrically and mechanically.  When requested, MSI’s testing department can provide detailed reports.


MSI TransformersStandard electrical tests include:

  • Turns ratio
  • Dielectric withstand test, commonly referred to as a “Hi-pot” test – Test voltages up to 50 kV AC, 5 kV DC
  • Induced voltage test at double the nominal voltage at 400 Hz
  • Excitation current
  • Open circuit voltage


Optional electrical tests include:

  • Temperature rise by resistance
  • Winding resistance
  • Insulation resistance
  • No-load and load loses
  • Transformer impedance